FIG. 44. A Nemertime Tetrastemma. 

 Actual length about i \ inch. 



FIG. 45. Diagram of Nemertine 

 Nemertopsis. 



eg and sg, Sense organ ; a, eyes ; gh^ brain ; 

 ^/, blood vessels ; , nerve cord ; d, ali- 

 mentary canal ; ex, nephridia ; r, snout, 

 withdrawn. 



